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Other Terms: Renal venous tree
The renal veins form arches at the bases of the medullary pyramids. They accompany the arteries to the sinus of the kidney. The renal veins are each formed at the hilum of the kidney by the union of three to six tributaries. They lie in front of the renal arteries. They are an exception to the general rule that the veins of the abdomen lie behind or on the same plane as the arteries. They differ in length, the right is shorter. The left renal vein receives the left testicular or ovarian, suprarenal, and phrenic veins.